Microstructure of ASTM A335 P11 Pipes, Welding Seam & HAZ

The microstructure of ASTM A335 seamless pipes(base metal) which consists of ferrites and pearlites, as well as a small amount of granular bainites and carbides.

The microstructure of the welding seam of ASTM A335 P11 pipes which consists of pearlites, ferrites, granular bainites and some tiny granular carbides. Some coarse ferrites are distributed along the grain boundary in mesh-grid lattice.

The microstructure of heat affected zones in welding joints of ASTM A335 pipes which consists of granular bainites, ferrites, pearlites and small amount of carbides.